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#1
11-10-2003, 03:02 AM
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Muncie 4 speed ID info
Can anyone tell me how to identiify these trans?
PO422 PO204 This numbers came from the right side if trans is facing forward. stamped in. Thanks [img]/ubbthreads/images/graemlins/worship.gif[/img] 
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#2
11-10-2003, 03:08 AM
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Re: Muncie 4 speed ID info
P=Muncie O=1970 4=April 22=Day P=Muncie O=1970 2=February 04=Day You have seem to have missed the last letter in the code A,B or C. The "MOF"
__________________
"POTTER BROS. SUPERCARS" 72 Nova SS "My first car of 30yrs" 70 LS-6 Chevelle Double Blk 30k survivor
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#3
11-10-2003, 03:10 AM
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Re: Muncie 4 speed ID info
Case is extremely clean and there are no other letters or numbers but the input shaft has no rings cut in them.
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#4
11-10-2003, 03:20 AM
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Re: Muncie 4 speed ID info
Is the input shaft a fine spline or course spline shaft.
What is the size of the output shaft,Does it have a LARGE counter pin located in the front of the trans or a smaller pin.I compare the rear shaft size to a TH-350 Yoke or TH-400 Yoke.No grove and 1 grove is close ratio and 2 groves would be wide ratio."MOF"
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"POTTER BROS. SUPERCARS" 72 Nova SS "My first car of 30yrs" 70 LS-6 Chevelle Double Blk 30k survivor
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#5
11-10-2003, 03:29 AM
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Re: Muncie 4 speed ID info
These are either 1965 or 1966 model year Muncie's. 1967 and later used a letter code for the month. 1963 1/2 and 1964 had the P-code on the left side. If you could post the main case casting number I could give you the model year... Crash
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#6
11-10-2003, 03:32 AM
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Re: Muncie 4 speed ID info
one one of them it is 3952661 I'll have to get the other one from my buddies shop.
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#7
11-10-2003, 01:09 PM
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Re: Muncie 4 speed ID info
661's aren't '66 or '67's! I think they started in '70 and went through '74 or '75?
Sounds like they might be replacement cases.
__________________
Marlin 70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride) 69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride) 67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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#8
11-16-2003, 05:32 AM
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Re: Muncie 4 speed ID info
If the case is a 661 and the input has no ring on the splines it would have to be an M-22. The spline number does not matter for that year since they made both fine and coarse spline input shafts on rockcrushers. Kevin
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-------------------------------------------------- 68SS Camaro L-78
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#9
11-18-2003, 12:13 PM
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Re: Muncie 4 speed ID info
I have worked on a lot of these 4 speeds and have never seen a coarse inpuit spline on a rockcrusher M-22. Are you sure of that statment?
__________________
70 BM Phase III GT Vette 69 BM SS427 GT vette? 69 L78 Nova 7k mi 73 Pantera 69 Vette B/P SCCA
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#10
11-18-2003, 12:25 PM
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Re: Muncie 4 speed ID info
not all M22 were fine spline
don't go by rings on input shaft to ID a trans To me, best way is look at input shaft gear. If it has 26 teeth on 45 deg angle it's M21 If it has 26 teeth on a 20 deg angle it's M22 It it has less then 26 teeth it's M20
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